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ee.Algorithms.TemporalSegmentation.VCT
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植被變化追蹤器：使用密集的 Landsat 時間序列堆疊，自動重建近期的森林干擾記錄。
輸出結果是每個像素的 2D 陣列，包含 6 列 x N 年。輸出資料列包含：輸入年份、VCT 土地覆蓋遮罩、UD 合成項的量值、B4 的干擾量值、NDVI 的干擾量值、dNBR 的干擾量值。
請參閱：Huang, C.、Goward, S.N.、Masek, J.G.、Thomas, N. Zhu, Z. 和 Vogelmann, J.E.，2010 年。使用密集的 Landsat 時間序列堆疊，自動重建近期森林干擾歷史記錄。Remote Sensing of Environment, 114(1), pp.183-198.
| 用量 | 傳回 |
|---|
ee.Algorithms.TemporalSegmentation.VCT(timeSeries, landCover, maxUd, minNdvi, forThrMax, nYears) | 圖片 |
| 引數 | 類型 | 詳細資料 |
|---|
timeSeries | ImageCollection | 要從中擷取 VCT 擾動的集合，包含以下波段：B3、B4、B5、B7、熱能、NDVI、DNBR 和 COMP。這個集合預計每年會包含 1 張圖片，並依時間排序。 |
landCover | ImageCollection | 要從中擷取 VCT 遮罩的集合。這個集合應包含 timeSeries 中每張圖片的 1 張圖片，並依時間排序。 |
maxUd | 浮點數，預設值為 4 | 偵測森林的 Z 分數複合值上限。 |
minNdvi | 浮點值，預設值為 0.45 | 森林的最低 NDVI 值。 |
forThrMax | 浮點值，預設值為 3 | 森林的最高門檻。 |
nYears | 整數，預設值為 30 | 年數上限。 |
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上次更新時間：2025-07-26 (世界標準時間)。
[null,null,["上次更新時間：2025-07-26 (世界標準時間)。"],[[["\u003cp\u003eThe Vegetation Change Tracker (VCT) automatically reconstructs forest disturbance history using dense Landsat time series stacks.\u003c/p\u003e\n"],["\u003cp\u003eVCT identifies disturbances by analyzing changes in spectral indices like NDVI, dNBR, and UD composite over time.\u003c/p\u003e\n"],["\u003cp\u003eThe output provides a per-pixel disturbance magnitude for each year within the analyzed Landsat time series.\u003c/p\u003e\n"],["\u003cp\u003eUsers can customize parameters like maximum UD composite value and minimum NDVI for forest detection.\u003c/p\u003e\n"],["\u003cp\u003eVCT requires input Landsat time series collections with specific bands, including B3, B4, B5, B7, thermal, NDVI, DNBR, and COMP.\u003c/p\u003e\n"]]],["Vegetation Change Tracker (VCT) reconstructs forest disturbance history using Landsat time series. It requires yearly image collections of `timeSeries` (containing specific bands) and `landCover` to produce a per-pixel 2D array. This array contains information for each year, including the VCT landcover mask, and the magnitude of disturbances based on UD composite, B4, NDVI, and dNBR. VCT's function can be customized by using arguments like `maxUd`, `minNdvi`, `forThrMax`, and `nYears`.\n"],null,["# ee.Algorithms.TemporalSegmentation.VCT\n\nVegetation Change Tracker, an automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks.\n\n\u003cbr /\u003e\n\nThe output is a 2D array per pixel containing 6 rows x N years. The output rows contain: input years, VCT landcover mask, magnitude in term of the UD composite, magnitude of distubance in B4, magnitude of distubance in NDVI, magnitude of distubance in dNBR.\n\nSee: Huang, C., Goward, S.N., Masek, J.G., Thomas, N., Zhu, Z. and Vogelmann, J.E., 2010. An automated approach for reconstructing recent forest disturbance history using dense Landsat time series stacks. Remote Sensing of Environment, 114(1), pp.183-198.\n\n| Usage | Returns |\n|-----------------------------------------------------------------------------------------------------------------------|---------|\n| `ee.Algorithms.TemporalSegmentation.VCT(timeSeries, landCover, `*maxUd* `, `*minNdvi* `, `*forThrMax* `, `*nYears*`)` | Image |\n\n| Argument | Type | Details |\n|--------------|----------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `timeSeries` | ImageCollection | Collection from which to extract VCT disturbances, containing the bands: B3, B4, B5, B7, thermal, NDVI, DNBR, and COMP. This collection is expected to contain 1 image for each year, sorted by time. |\n| `landCover` | ImageCollection | Collection from which to extract VCT masks. This collection is expected to contain 1 image for each image in the timeSeries, sorted by time. |\n| `maxUd` | Float, default: 4 | Maximum Z-score composite value for detecting forest. |\n| `minNdvi` | Float, default: 0.45 | Minimum NDVI value for forest. |\n| `forThrMax` | Float, default: 3 | Maximum threshold for forest. |\n| `nYears` | Integer, default: 30 | Maximum number of years. |"]]
